Trimble Outdoors SPSX51 - Manual (Page 41)

SPSx51 Modular GPS Receivers User Guide 39
Setup Guidelines 4
• Do not locate the receiver or antenna within 400 meters (about 1,300 ft) of
powerful radar, television, cellular communications tower, or other transmitters
or GPS antennas. Low-power transmitters, such as those in cellular phones and
two-way radios, normally do not interfere with receiver operations. Cellular
communication towers can interfere with the radio and can interfere with GPS
signals entering the receiver. This does not harm the receiver, but it can prevent
the receiver electronics from functioning correctly.
• Do not use the rover receiver directly beneath or close to overhead power lines
or electrical generation facilities. The electromagnetic fields associated with
these utilities can interfere with GPS receiver operation. Other sources of
electromagnetic interference include:
– gasoline engines (spark plugs)
– televisions and computer monitors
– alternators and generators
– electric motors
– equipment with DC-to-AC converters
– fluorescent lights
– switching power supplies
• Trimble recommends that, wherever possible, all GPS receiver equipment is
protected from rain or water. Although, the receivers are designed to withstand
all wet weather conditions, keeping the receivers dry prolongs the life of the
equipment and reduces the effects of corrosion on ports and connectors. If the
equipment gets wet, use a clean dry cloth to dry the equipment and then leave
the equipment open to the air to dry. Do not lock wet equipment in a transport
case for prolonged periods. Wherever possible, avoid exposing the GPS receiver
to corrosive liquids and salt water.
• If you are using the rover receiver in open spaces, Trimble recommends that you
stop work during electrical storms where the risk of lightning strike is high.
• Where cables are involved, Trimble recommends that you use cable ties to
secure the cables to the rod or other equipment to avoid inadvertent snagging
while moving about the jobsite. Be careful not to kink, twist, or unnecessarily
extend cables, and avoid trapping them in vehicle doors or windows. Damage to
cables can reduce the performance of GPS equipment.
Internal radio setup for rover operations
The internal radio of the SPS GPS receiver is delivered with the transmit (Tx) radio
frequencies preprogrammed into the receiver. To add receive (Rx) radio frequencies to
450 MHz radios, use the WinFlash utility or web interface (see
Appendix C, Adding
UHF Internal Radio Frequencies ). Network channels can be selected for the 900 MHz
radios.